Retail LED Spectrum Optimization via Blue Peak Wavelength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LED lighting solutions for retail applications face challenges in achieving high efficiency, color rendering index (CRI), and optimal white perception, with existing solutions either compromising on efficiency or color saturation, and there is a need for a lighting device that can provide a high gamut area index (GAI) and color saturation while maintaining energy efficiency.
Innovation Solution
A lighting device comprising a solid-state light source emitting blue light with a peak wavelength between 430-455 nm, combined with first and second luminescent materials that convert the light to achieve a CRI of at least 90, a GAI of at least 100, and a R9 value of at least 70, with a R50 value of no more than 455 nm, allowing for efficient and effective color rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If deep blue light (400-440 nm) is added to excite optical brightness agents, then white perception and color rendering are improved, but efficiency deteriorates
Solution Approach 1:
The patent changes the peak wavelength parameter of the blue light from conventional 440-460 nm to a shorter wavelength range of 430-455 nm, specifically optimizing it to 435-445 nm. This parameter change allows the blue light to effectively excite optical brightness agents in white fabrics and materials, improving white perception and color rendering (CRI ≥90) while maintaining energy efficiency by avoiding excessive deep blue content that would harm efficiency
2Manufacturing precision
If blue light peak is shifted to shorter wavelengths, then color saturation and gamut area index are improved, but efficiency penalty increases
Solution Approach 1:
The patent optimizes the blue light peak wavelength to a specific range of 430-455 nm (preferably 435-445 nm), which is shorter than conventional blue LEDs. This parameter change increases the gamut area index to at least 100 and improves color saturation (R9 ≥70) while controlling the efficiency penalty by not extending too far into the deep blue region where efficiency losses would be excessive
Solution Approach 2:
The patent uses a composite approach combining blue light-emitting material with yellow and red phosphor materials. The blue light source with optimized peak wavelength (430-455 nm) excites the yellow phosphor (emitting 560-580 nm) and red phosphor (emitting 610-650 nm), creating a synergistic effect that achieves high color saturation and GAI while the phosphors convert some blue light to longer wavelengths, reducing the efficiency penalty of the shorter wavelength blue light
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a high-efficiency lighting device that achieves excellent color rendering and gamut area index, offering a perception similar to CDM-elite lighting with minimal efficiency penalty, by shifting the blue peak to shorter wavelengths and optimizing the absorption of phosphors, resulting in improved white rendering and color saturation.
Implementation Method 1
a solid state light source configured to provide blue light, a first luminescent material configured to convert at least part of the blue light into first luminescent material light, and a second luminescent material configured to convert at least part of the blue light and/or the first luminescent material light into second luminescent material light
Data Source
AI summary
The invention provides a lighting device (100) configured to provide lighting device light (101), the lighting device (100) comprising a solid state light source (10) configured to provide blue light (11) having a peak wavelength (λPWL) selected from the range of 430-455 nm, a first luminescent material (210) configured to convert part of the blue light (11) into first luminescent material light (211) and a second luminescent material (220) configured to convert part of one or more of the blue light (11) and the first luminescent material light (211) into second luminescent material light (221), wherein the solid state light source (10), the first luminescent material (210), and the second luminescent material (220) are selected to provide at a first setting of the lighting device (100) white lighting device light (101) having a CRI of at least 90, a R9 value of at least 70, and a R50 value of at maximum 465 nm, wherein the R50 value is defined as a first wavelength (λ50) in a spectral distribution of the white lighting device light (101) at the first setting, wherein the first wavelength (λ50) is a wavelength closest to the peak wavelength (λPWL) but at a longer wavelength than the peak wavelength (λPWL) of the blue light (11) where the peak intensity (I50) is 50% of the intensity (IPWL) at the peak wavelength (λPWL).